If we long for our planet to be important, there is something we can do about it. We make our world significant by the courage of our questions and by the depth of our answers. Cosmos (1980)
Every thinking person fears nuclear war and every technological nation plans for it. Everyone knows it's madness, and every country has an excuse. Cosmos: A Personal Voyage (1990)
Advances in medicine and agriculture have saved vastly more lives than have been lost in all the wars in history. The Demon-Haunted World : Science as a Candle in the Dark (1995)
If a marker were to be erected today, it might read, in homage to his scientific courage: “He preferred the hard truth to his dearest illusions.” Cosmos (1980)
We can judge our progress by the courage of our questions and the depths of our answers, our willingness to embrace what is true rather than what feels good. Misattributed